c# reversing and serializing a dictionary using linq -

was wondering possible reverse dictionary in single linq statement?

the structure follows;

dictionary<string, list<string>> original = new dictionary<string, list<string>>()      {         {"s", new list<string>() { "1", "2", "3" }},         {"m", new list<string>() { "4", "5", "6" }},         {"l", new list<string>() { "7", "8", "9" }},         {"xl", new list<string>() { "10", "11", "12" }},     }; 

which convert dictionary of type;

dictionary<string, string> reverse = new dictionary<string, string>()     {         {"1", "s"},         {"2", "s"}, //and on     }; 

you can use selectmany split value sublists, , reverse keys & values new dictionary using todictionary

var result = original     .selectmany(k=> k.value.select(v => new { key = v, value = k.key } ))     .todictionary( t=> t.key, t=> t.value);